1/*
2 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB.  If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20#ifndef SVGTextLayoutEngineBaseline_h
21#define SVGTextLayoutEngineBaseline_h
22
23#include "core/rendering/style/SVGRenderStyleDefs.h"
24#include "wtf/Noncopyable.h"
25
26namespace blink {
27
28class Font;
29class RenderObject;
30class SVGElement;
31class SVGRenderStyle;
32class SVGTextMetrics;
33
34// Helper class used by SVGTextLayoutEngine to handle 'alignment-baseline' / 'dominant-baseline' and 'baseline-shift'.
35class SVGTextLayoutEngineBaseline {
36    WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngineBaseline);
37public:
38    SVGTextLayoutEngineBaseline(const Font&);
39
40    float calculateBaselineShift(const SVGRenderStyle&, SVGElement* lengthContext) const;
41    float calculateAlignmentBaselineShift(bool isVerticalText, const RenderObject* textRenderer) const;
42    float calculateGlyphOrientationAngle(bool isVerticalText, const SVGRenderStyle&, const UChar& character) const;
43    float calculateGlyphAdvanceAndOrientation(bool isVerticalText, const SVGTextMetrics&, float angle, float& xOrientationShift, float& yOrientationShift) const;
44
45private:
46    EAlignmentBaseline dominantBaselineToAlignmentBaseline(bool isVerticalText, const RenderObject* textRenderer) const;
47
48    const Font& m_font;
49};
50
51} // namespace blink
52
53#endif
54